The Prelude: Post Credits The Delta Episode

After the credits, reload your game file to trigger a brief cutscene (a non-interactive cinematic the game plays automatically).

An alert will sound at the Mossdeep Space Center regarding a meteor strike southwest of Sootopolis.

You regain control in your room in Littleroot Town. Head downstairs to receive a Pair of Tickets to a Litleonid meteor shower viewing in Mossdeep.

Your parents suggest inviting May/Brendan from next door.

Head next door and you will meet Zinnia and her Whismur.

May/Brendan is found next door, injured, with their Key Stone (like your Mega Bracelet) having been taken by Zinnia.

Zinnia is reportedly heading to Petalburg. Fly to Petalburg City.

In Petalburg City, head northwest to Wally’s uncle’s house.

You will find Wally being bothered by Team Aqua/Magma Admin Courtney (in Omega Ruby) or Matt (in Alpha Sapphire).

The Admin reveals Team Aqua/Magma is after Key Stones and has taken Wally's.

Battle the Admin. Courtney gives 5,300 and has a Camerupt Lv. 53. Matt gives 5,300 and has a Sharpedo Lv. 53.

The Admin flees, mentioning something happening at Meteor Falls.

Steven will call, asking you to meet him at Devon Corp. in Rustboro City. Fly to Rustboro.

Heal your Pokémon at the Pokémon Center.

Go north to Devon Corp. Steven will meet you outside and lead you inside to his father’s office.

Steven’s father explains the history of Infinite Energy, referencing AZ from Kalos and the ultimate weapon he created.

He reveals that a massive asteroid, approximately six miles (10 kilometers) in diameter, is on a collision course with the planet.

Research at Mossdeep aims to stop the asteroid, but a Meteorite Shard is needed.

Steven believes these shards may be in Granite Cave, west of Dewford, the same cave where you first met him and saw ancient wall paintings. Your objective is to retrieve one from Granite Cave.